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Power circuit

  • US 8,638,129 B2
  • Filed: 08/20/2008
  • Issued: 01/28/2014
  • Est. Priority Date: 08/20/2008
  • Status: Active Grant
First Claim
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1. A circuit for driving a power transistor having a control electrode and a load path, the circuit comprising:

  • a driver circuit configured to drive the power transistor via a control signal supplied to the control electrode so as to control the on and off state of the power transistor; and

    a series circuit comprising a semiconductor switching element and a capacitor, the series circuit being coupled in parallel with the load path and the capacitor providing a supply voltage to the driver circuit,wherein the driver circuit, when the supply voltage falls below a first threshold value, is configured to drive the power transistor via the control signal to create a voltage drop across the load path of the power transistor which is higher than the first threshold value, wherein the first threshold value is greater than a minimum value of the supply voltage required for proper operation of the driver circuit.

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